Perforating machine



April 7, 1931. H. s. LYNESS 1,799,305

PERFORATING MACHINE Filed July 13, 1928 Patented Apr. 7, 1931 NITED s'rA'rs HORATIO S. LYNESS, OF LYNN, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MA PATENT. OFFICE CHINERY CORPORATION, OF PATEESGN, NEW' JERSEY, A CORPORATION OF NEW JERSEY PERFORATING- MACHINE Application filed July 13,

operating presser member so that at a single operation of the machine the cutting of a plurality of perforations corresponding to the whole pattern of the die is effected. On account of the heavy cutting pressure required between the die and the presser memher in order to" effect a clean-cut severance of the cut-out pieces of leather, perforating machines of this class are usually designed with a frame having heavy lateraltie members. On this account, limited clearance is allowed for the die between them and itis the practiceto mount the die so that it may be brought forwardly out of range of the presser member to allow the operator to position the work accurately over the die while it is in plain view. The die and the superposed work piece are then pushed back into the frame of the machine within the range of the presser member.

Various hold-down members have been designed with a view to positioning the work piece with reference to the die and holding it in position while it is being presented in cutting position. In one of its aspects, the present invention consists in a die having an improved hold-down device for use in connection with a perforating machine of this type, While in another aspect it consists in an organization of perforating machine parts, including a movable die holder, die andstripper plate combined in novel fashion with a hold-down element.

In still another aspect, the invention con sists broadly in a die having a reversible hold-down device whereby a shoe part may be presented either side up in cutting position. The character of the cut-out or perfo- 1928. Serial No. 292,406.

ration desired in shoe parts is usually nonsymmetrical and must, therefore, be reversed in the right and left parts. Inasmuch as it is not practical to locate a shoe part by reference to its lined side, it has been the practice to provide right and left dies or die gangs and to set the machine up for right and left shoe parts by using these dies respectively. Where the cut-out is extensive or intricate in its design, the expense of right and left-hand dies is a considerable item. There is, moreover, considerable loss of time in removing and replacing the right and left dies and the problem of storage space for two dies of each pattern used by the manufacturer. 7 1

With these considerations in view, an object of the invention is to provide a reversi hle hold-down wherein a shoe part may be located always from its finished surface and then presented to a non-symmetrical die either side up in cutting position. To this end, an important feature of the invention consists in a hold-down comprising superposed holding members each having a workopening for the die and an associated position locating device or gauge whereby a right or left shoe part may be located by reference to its finished side.

A further feature of the invention consists in means for detachably retaining the holddown in position upon a die holder which will permit the hold-down to be removed and disposed either side up to receive the shoe part, according as it is a right or a left part. Having positioned the shoe part, gauging itfrom its finished face in respect to one plate if it is a right part and in respect to the other plate if it is a left plate, the holddown is replaced as a unit with the work piece either side up, as the case may be.

The hold-down. preferably comprises a pair of superposed holding membershaving oneelement of a hinge connection, while the die holder is'provided with the other element of the hinge connection. The shoe part may be located in the hold-down while the latter is connected to the die holder and by referenceto the finishedside of the part, or the hold-down may be detached and reversed to receive the shoe part and then turned back to its initial position and replaced above the die.

These and other features of the invention will be best understood and appreciated from the following description of a preferred embodiment thereof, selected for purposes of illustration and shown in the accompanying drawings, in which Fig. 1 is a view in perspective of a die holder equipped with the reversible holddown;

Fig. 2 is a plan view of the same;

Fig. 3 is a view in side elevation with parts broken away;

Figs. 4: and 5 are views in perspective, on a smaller scale, showing the hold-down in two positions; and

Fig. 6 is a view in perspective of a shoe part which has been perforated bythe die shown in the drawings.

The die holder and die herein shown may be used in a perforating machine of any well-known commercial type such, for example, as that fully disclosed in U. S. Letters Patent No. 1,439,019, granted December 19, 1922 upon an application of C. W. Newton, to which reference may be had for details of the machine construction.

The die holder comprises a rectangular plate 10 adapted to be secured by a. screw stud 11 to a sliding carrier supported on the bed of the machine and to be moved in and out thereon for placing the work in position and presenting it to the machine. A die block 12 is rigidly secured to the plate 10 and carries the individual dies 14; of the gang or pattern. The individual dies are arranged with their cutting edge uppermost and register with openings in the die block which permit the passage of the cut-out pieces of the work. As herein shown the pattern coniprises a number of elongated and square individual dies arranged nonsymmetrically and constituting a multiple die for producin in the vamp of a shoe the design shown in Fig. 6. This it will be observed, is not symmetrical so that it mustbe reversed in right and left parts.

Associated with the die gang is a stripper plate 16 having downwardly extending posts 18 which slide in sockets in the plate 10 and being normally maintained in a position slightly above the cutting edges of the die gang by compression springs which encircle the posts 18. The stripper plate 16 has a cutout opening shaped to surround the die gang so that when the stripper plate is depressed in the dieing-out operation the work piece is brought into contact with the cutting edges of the die. All of the construction above described may be of any commercial or well known construction.

The hold-down device comprises a pair of plates or leaves 30 and 32, corresponding in their general outline to the shape of the die carrier 10 and hinged together at their forward end by being riveted to the sides of spring plates 37 which are folded so as to form a hinge 36 and act to maintain the plates 30 and 32 separated, so that the operator may conveniently present a work piece between them. The hinges 36 are each extended outwardly in the form of a stud or sleeve and act as one member of a hinge for the hold-down in its entirety. The outstanding portions of the hinge 36 are received in curved slots formed by hook-shaped members 20 secured rigidly to the sides of the die carrier 10 and extending beyond its front end. A leaf spring 22 is secured to the surface of the die carrier adjacentto each of the hook members 20 and arranged so as to underlie the hinge 36 and hold it normally in position at the end of the slot in the hook members 20. The arrangement is such that the holddown may be detached from the die carrier by pulling it rearwardly so that the springs 22 are forced down and the hinge members 36 allowed to pass out under the end of the hook. Similarly, the hold-down may be replaced by positioning the hinge members opposite the ends of the hooks and pushing it forwardly.

The hold-down plate 32 is provided with an opening 33 of the same general shape as that in the stripper plate 16 but has position locating devices comprising at its rear edge the gauge points 45 and at its rightside a gauge finger 40. The plate is provided with similar opening and has a similar gauging finger 4-1. These openings register and expose the portion of the work in which the perforated design is to be formed. Both of the plates are extended at the rear of the work-openings sufficiently to enable the operator to handle them conveniently and to close the plates together upon the work piece and hold them in this condition during the dieing-out operation. Both of the plates are provided with slots near one corner which register with a pin 34 projecting from the die carrier and so positively locate the hold-down in proper position when it is depressed. The pin 34 and slots 35 determine positively and accurately the transverse position of the hold-down at its rear or outer end. At its forward end, the plates 30 and 32 are notched to fit between the side surfaces of the hook members 20 so that the hold-down is positively positioned by them at its other end.

The plates 30 and 32 of the hold-down are provided with co-acting curved portions 33 between which the work is engaged in a bent condition so that the gripping action of the plates is intensified and the Work held securely against displacement.

In using the hold-down of my invention in perforating Vamps, such asthat shown in Fig. 6, the vamp ispoeitioned between the plates of the hold-down with its finished side 15 up and by reference to the gauge points of the plate which is uppermost. Such a condition is shown in Fig. 4, where it will be seen that the recess between the two buttonhole tongues is locatedwith respect to the gauge finger 40 and the upper edge of the vamp with respect to" the gauge fingeselS. The vamp may be located freely and accurately while the plates of the hold-down are held lightly together by the operator, either while the hold-down occupies the position shown in Fig. 1 or when it has been removed from the die holder andplaced upon the bench. The hold-down plates are then pressed together, flattening the work to be perforated and holding it in gauged position. The hold-down being in position, and interlocked with the die carrier is pushed into operative position and the'perforating operation takes place.

In dealing with a left vamp which must be presented to the die with the lined side 17 uppermost, the hold-down is detached from the die holderand reversed, as suggested in Fig. 5, and the vamp located with respect to the gauge points 45 of the plate 30 instead of 32. WVhen the vamp has been'positioned or interleaved as already explained, the holddown is reversed in its entirety together with the work piece and returned to position upon the die carrier with the same side of the hold down up as before but with the vamp reversed. In the dieing-out operation which ensues, a pattern in reversed position is pr duced in the shoe part. 7

It will be apparent'that the operation of locating the vamp in the latter case is performed as before except for its reversal in position, that is to say, the Vamp is located from its finished side with reference to the gauge finger 41 which is now disposed at the left side of the hold-down instead of the gauge lingertO which in the preceding operation, with the hold-down reversed, was located at the right side of the hold-down.

While I prefer to shape the two plates of the hold-down similarly, it is not important to do so as it is essential only to provide members which will retain the shoe part in position and afford gauging means of some kind.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is: V

'1. In combination, a die having a base,

and a reversible hold-down having a readily detachable connection with said ase, comprising readily removable, reversible, superposed holding members each having a work opening and an adjacent position-locating device, whereby a shoe part may be located by reference to its; finished side between said holding members and presented either side up in cutting position.

2. In combination, a die, and a reversible hold-down detachably connected thereto, comprising a pair of jointly removable, interconnected superposed sheet metal members having similarly disposed non-symmetrical openings therein in respect to which shoe part may be located by reference to its fin-' of the interlocking connection with the die holder. i

4 In combihatiomadie, and a detachable hold-down for said die, comprising hinged holding plates for an interposed shoe part and having work-openings of identical size and shape therein, a'gauge device associated with one plate for locating a right shoe part, a gauge device associated with the other plate for locating a left shoe part, and means for accurately locating the hold-down as a unit with respect to said die with the shoe part contained therein.

5. In a perforating machine, a die holder, a multiple die carried thereby, a hold down comprising connected holding platesbetween which a shoe part may be placed either side up and having registering openings for the die, and means for retaining the hold-down in position upon the die holder with either the finished face or the lined face of. the shoe part toward the die at the option of the operator. i

a 6. In a perforating machine, a die holder,

a die'carried thereby, a-holdedown detachably mounted with respect to said die and having two gripping elements constructed and arranged to retain a shoe part between said elements and to be reversed to locate it either side up in a flat condition above the die, said elements having extending therethrough an openingsimilar in contour to the outline of the 6.18, and means for positioning 7 said hold-down and the gripped workupon the die. j

7. ln'a perforating machine, a die holder, a non-symmetrical .die gang carried thereby, a hinge element located upon the die holder, and a hold-down comprising separable plates normally supported as a unit-above the die gang and having .a hinge element con'struct ed and arranged to cooperate with and to be separated from thehinge element uponthe die holder, to allow pivotal movement of the ice hold-down with respect to the die holder and removal therefrom.

hinge element located upon the die holder,

removable hold-down for gripping and supporting a shoe part in substantially flat condition above the (lie and having a cooperating detachable hinge element, and a spring for detachably holding said latter hinge element in the hook of the former element.

9. In a perforatingmachine, die holder carrying a die, a spring actuated stripper plate associated therewith, a hold-down connected to the die holder and adapted to overlie the stripper plate and comprising members bet-ween which a shoe part may be interleaved and presented to the die as a unit with the hold-down above the stripper plate.

10. In a perforating machine, a die holder carryinga die, hook members secured to one end of the holder and constituting one element of a hinge, a hold-down comprising hinge-d plates with hinge pintles ex ended to fit in said hook members, and springs for detachably retaining said pintles in place in the hook members.

11. In a perforating machine, a die holder carrying a die, hinge members secured to the die holder, a hold-down comprising gripping plates having cooperating hinge members, said hinge members being so shaped as to be engageable and disengageable by relative longitudinal movement of the die holder and hold-down.

12. In a perforating machine, a die holder carrying a die, a hold-down comprising superposed holding plates hinged together and to the die holder, and means for accurately registering the hold-down with reference to the 'die.

13. In a perforating machine, a die holder carrying a die, a hold-down comprising normally separated hinged holding plates, means for separating said plates, means for connecting said plates to the rear end of the die holder, said plates being extended toward the front of the die holder to afford opportunity for the operator to press the holding plates together to hold a work piece and retain them in that condition during the operation of the machine.

14;. In a perforating machine, a die, a removable and reversible hold-down comprising connected plates, one having gauges for a right shoe part and the other having gauges for a left shoe part, whereby a right or left shoe part may be located with reference to one plate or the other with its finished face uppermost, and means for positioning the hold-down with respect to the die as a unit with its contained shoe part.

15. In a perforating machine a non-symmetrical die, a hold-down therefor comprising superposed holding members with regis tering non-symmetrical openings therein similar to but larger than the contour of the die, and gauges effective on opposite faces of the hold-down for locating respectively reversely shaped shoe parts between the hold in members.

16. In combination, a die, a removable hold=down mounted in predetermined relation thereto and comprising cooperating gripping members portions of which are substantially plane, said members being also provided with co-acting portions bent out of the planes of said other portions and constructed and arranged to hold a shoe part between them in bent condition even though said hold-down is removed, and gauge devices associated with the gripping members 17. In a perforating machine, a die holder carrying a die, and a hold-down comprising gripping plates held in superposed relation and resilient means for separating said plates to permit insertion of the work, together with means for positioning said gripping plates with respect to the die.

In testimony whereof I have signed my name to this specification.

HORATIO S. LYNESS. 

